I come from the print media industry, but find moving pictures waaaay more fun to work on. I shoot/edit video & audio, do motion design and 3D.
Lots of great answers above. I will just add to be sure you aren't panning too quickly. This can contribute to a lot of jerkiness that no stabilizer rig can fix.
Double check the settings on the monitor to see if there is an option to match frame rate to the camera. The GH3 and GH4 cameras are finicky about their HDMI output. As dj73 mentions, switching between MOV and AVCHD sometimes makes the handshake happen, but I have never been able to send 30fps via MOV out of the GH4's HDMI port.
Guy - Very nice audio quality.
I agree it is very similar to SmartSound w/SonicFire Pro software. I use that on occasion, and find it can work very well. I am a musician, so I understand how some will cringe at the thought of these kinds of products, and canned music in general. However, in the hands of someone with musical knowledge and good editing skills, the results can be acceptable. Sure, it won't replace a proper composer, a room full of musicians and a recording studio....but some projects don't have a budget for that.
My brain thinks the price is a bit steep but my back and knees scream "Buy it."
This is a brilliant tool for selling gaff tape (kind of like cheap ink jet printers that make a fortune selling expensive ink). What would be amazing would be a tool that REMOVES the gaff tape, and puts it back into a roll for re-use. Yes, I'm cheap and known to actually re-use gaff tape!
I love what 4K brings to post production. I try to separate the consumer marketing hype with the practical applications of 4K. Even if 4K broadcast never becomes commonplace, I'm happy to have the option to shoot/edit 4K footage.